Sponge brush



FIG. 1 is a top, front, and left side perspective view of a sponge brush showing our design;

FIG. 2 is an enlarged front elevational view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a rear elevational view thereof; and,

FIG. 6 is a bottom plan view thereof. 

The ornamental design for a sponge brush, as shown and described. 